#!/usr/bin/python
#
# Copyright 2009 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Contains extensions to Atom objects used with Google Health."""

__author__ = 'api.eric@google.com (Eric Bidelman)'

import atom
import gdata


CCR_NAMESPACE = 'urn:astm-org:CCR'
METADATA_NAMESPACE = 'http://schemas.google.com/health/metadata'


class Ccr(atom.AtomBase):
    """Represents a Google Health <ContinuityOfCareRecord>."""

    _tag = 'ContinuityOfCareRecord'
    _namespace = CCR_NAMESPACE
    _children = atom.AtomBase._children.copy()

    def __init__(self, extension_elements=None,
                 extension_attributes=None, text=None):
        atom.AtomBase.__init__(self, extension_elements=extension_elements,
                               extension_attributes=extension_attributes, text=text)

    def GetAlerts(self):
        """Helper for extracting Alert/Allergy data from the CCR.

        Returns:
          A list of ExtensionElements (one for each allergy found) or None if
          no allergies where found in this CCR.
        """
        try:
            body = self.FindExtensions('Body')[0]
            return body.FindChildren('Alerts')[0].FindChildren('Alert')
        except:
            return None

    def GetAllergies(self):
        """Alias for GetAlerts()."""
        return self.GetAlerts()

    def GetProblems(self):
        """Helper for extracting Problem/Condition data from the CCR.

        Returns:
          A list of ExtensionElements (one for each problem found) or None if
          no problems where found in this CCR.
        """
        try:
            body = self.FindExtensions('Body')[0]
            return body.FindChildren('Problems')[0].FindChildren('Problem')
        except:
            return None

    def GetConditions(self):
        """Alias for GetProblems()."""
        return self.GetProblems()

    def GetProcedures(self):
        """Helper for extracting Procedure data from the CCR.

        Returns:
          A list of ExtensionElements (one for each procedure found) or None if
          no procedures where found in this CCR.
        """
        try:
            body = self.FindExtensions('Body')[0]
            return body.FindChildren('Procedures')[0].FindChildren('Procedure')
        except:
            return None

    def GetImmunizations(self):
        """Helper for extracting Immunization data from the CCR.

        Returns:
          A list of ExtensionElements (one for each immunization found) or None if
          no immunizations where found in this CCR.
        """
        try:
            body = self.FindExtensions('Body')[0]
            return body.FindChildren('Immunizations')[0].FindChildren('Immunization')
        except:
            return None

    def GetMedications(self):
        """Helper for extracting Medication data from the CCR.

        Returns:
          A list of ExtensionElements (one for each medication found) or None if
          no medications where found in this CCR.
        """
        try:
            body = self.FindExtensions('Body')[0]
            return body.FindChildren('Medications')[0].FindChildren('Medication')
        except:
            return None

    def GetResults(self):
        """Helper for extracting Results/Labresults data from the CCR.

        Returns:
          A list of ExtensionElements (one for each result found) or None if
          no results where found in this CCR.
        """
        try:
            body = self.FindExtensions('Body')[0]
            return body.FindChildren('Results')[0].FindChildren('Result')
        except:
            return None


class ProfileEntry(gdata.GDataEntry):
    """The Google Health version of an Atom Entry."""

    _tag = gdata.GDataEntry._tag
    _namespace = atom.ATOM_NAMESPACE
    _children = gdata.GDataEntry._children.copy()
    _attributes = gdata.GDataEntry._attributes.copy()
    _children['{%s}ContinuityOfCareRecord' % CCR_NAMESPACE] = ('ccr', Ccr)

    def __init__(self, ccr=None, author=None, category=None, content=None,
                 atom_id=None, link=None, published=None, title=None,
                 updated=None, text=None, extension_elements=None,
                 extension_attributes=None):
        self.ccr = ccr
        gdata.GDataEntry.__init__(
            self, author=author, category=category, content=content,
            atom_id=atom_id, link=link, published=published, title=title,
            updated=updated, extension_elements=extension_elements,
            extension_attributes=extension_attributes, text=text)


class ProfileFeed(gdata.GDataFeed):
    """A feed containing a list of Google Health profile entries."""

    _tag = gdata.GDataFeed._tag
    _namespace = atom.ATOM_NAMESPACE
    _children = gdata.GDataFeed._children.copy()
    _attributes = gdata.GDataFeed._attributes.copy()
    _children['{%s}entry' % atom.ATOM_NAMESPACE] = ('entry', [ProfileEntry])


class ProfileListEntry(gdata.GDataEntry):
    """The Atom Entry in the Google Health profile list feed."""

    _tag = gdata.GDataEntry._tag
    _namespace = atom.ATOM_NAMESPACE
    _children = gdata.GDataEntry._children.copy()
    _attributes = gdata.GDataEntry._attributes.copy()

    def GetProfileId(self):
        return self.content.text

    def GetProfileName(self):
        return self.title.text


class ProfileListFeed(gdata.GDataFeed):
    """A feed containing a list of Google Health profile list entries."""

    _tag = gdata.GDataFeed._tag
    _namespace = atom.ATOM_NAMESPACE
    _children = gdata.GDataFeed._children.copy()
    _attributes = gdata.GDataFeed._attributes.copy()
    _children['{%s}entry' % atom.ATOM_NAMESPACE] = ('entry', [ProfileListEntry])


def ProfileEntryFromString(xml_string):
    """Converts an XML string into a ProfileEntry object.

    Args:
      xml_string: string The XML describing a Health profile feed entry.

    Returns:
      A ProfileEntry object corresponding to the given XML.
    """
    return atom.CreateClassFromXMLString(ProfileEntry, xml_string)


def ProfileListEntryFromString(xml_string):
    """Converts an XML string into a ProfileListEntry object.

    Args:
      xml_string: string The XML describing a Health profile list feed entry.

    Returns:
      A ProfileListEntry object corresponding to the given XML.
    """
    return atom.CreateClassFromXMLString(ProfileListEntry, xml_string)


def ProfileFeedFromString(xml_string):
    """Converts an XML string into a ProfileFeed object.

    Args:
      xml_string: string The XML describing a ProfileFeed feed.

    Returns:
      A ProfileFeed object corresponding to the given XML.
    """
    return atom.CreateClassFromXMLString(ProfileFeed, xml_string)


def ProfileListFeedFromString(xml_string):
    """Converts an XML string into a ProfileListFeed object.

    Args:
      xml_string: string The XML describing a ProfileListFeed feed.

    Returns:
      A ProfileListFeed object corresponding to the given XML.
    """
    return atom.CreateClassFromXMLString(ProfileListFeed, xml_string)
